Along with BBA certain diploma courses in computers you can do are:

Diploma in computer applications (DCA) which can be a 6-12 months duration.

With new innovations in this arena there is a growing demand for computer professionals with a sound understanding of basic computer applications in business covering key programming languages, data base management, systems analysis, computer software development in specific applications such as studies, financial management and long range planning.

You can do diploma course in the above topics mentioned.

Good Luck.